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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae0a00bd03862e1eb96103a8a0d947b567bda5699f5c0c04137609f7fff2e67' 
  AND token = 'fDSxAsZ3gu681wTB2heIjWUud9y9svfX4k+g602eE7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}